package org.apache.maven.lifecycle.mapping;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class DefaultLifecycleMapping implements LifecycleMapping {

  private List<Lifecycle> lifecycles;

  private Map<String, Lifecycle> lifecycleMap;

  /** @deprecated use lifecycles instead */
  private Map<String, String> phases;

  /**
   * Populates the lifecycle map from the injected list of lifecycle mappings (if not already done).
   */
  private void initLifecycleMap() {
    if (lifecycleMap == null) {
      lifecycleMap = new HashMap<String, Lifecycle>();

      if (lifecycles != null) {
        for (Lifecycle lifecycle : lifecycles) {
          lifecycleMap.put(lifecycle.getId(), lifecycle);
        }
      } else {
        /*
         * NOTE: This is to provide a migration path for implementors of the legacy API which did
         * not know about getLifecycles().
         */

        String[] lifecycleIds = { "default", "clean", "site" };

        for (String lifecycleId : lifecycleIds) {
          Map<String, String> phases = getPhases(lifecycleId);
          if (phases != null) {
            Lifecycle lifecycle = new Lifecycle();

            lifecycle.setId(lifecycleId);
            lifecycle.setPhases(phases);

            lifecycleMap.put(lifecycleId, lifecycle);
          }
        }
      }
    }
  }

  public Map<String, Lifecycle> getLifecycles() {
    initLifecycleMap();

    return lifecycleMap;
  }

  public List<String> getOptionalMojos(String lifecycle) {
    return null;
  }

  public Map<String, String> getPhases(String lifecycle) {
    initLifecycleMap();

    Lifecycle lifecycleMapping = lifecycleMap.get(lifecycle);

    if (lifecycleMapping != null) {
      return lifecycleMapping.getPhases();
    } else if ("default".equals(lifecycle)) {
      return phases;
    } else {
      return null;
    }
  }

}
